[BC] Audio "proofs"

[harold stanton]

Thread drifting.......................
 In the South, it was Claude Gray near Birmingham.
 He used the interpolation oscillator method as well.
 But, as 'dial tone" for identification.
 Always in the middle of the nite.You called him in your
fifteen minute assigned window. i once asked him about the
dial tone. He said that many folks then may be testing with
tones. but only his "folk" would be using a dial tone.
 Rcvr was a Super-pro. Oscillators, GenRad.
    Harold